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st: New version of -bspline- on SSC

From   Roger Newson <[email protected]>
To   [email protected]
Subject   st: New version of -bspline- on SSC
Date   Tue, 21 Oct 2003 11:40:05 +0100

Hello All

Thanks to Kit Baum, there is now a new version of -bspline- downloadable from SSC. In Stata, type -ssc desc bspline- to find out more.

The -bspline- package is described as below on my website. The new version is still Stata 6, but fixes 2 bugs, which caused it sometimes to ignore the -noexknot- option and always to disallow Stata 7+ 32-character names for the generated spline basis variables. I have also slightly revised the help file and the manual, which is distributed as -bspline.pdf-. I would like to thank Buzz Burhans for drawing my attention to the first of these bugs.

Best wishes


package bspline from

bspline: Create a basis of B-splines or reference splines

The bspline package contains the programs bspline and frencurv, whic
> h
generate bases of splines in an X-variable for inclusion in the
design matrix of a regression model. The program bspline generates a
basis of Schoenberg B-splines. The program frencurv ("French curve")
generates a basis of reference splines, spanning the same spline
space as the corresponding B-splines, but the fitted parameters
in the regression model corresponding to the reference splines are
simply values of the spline at reference points on the X-axis.
These parameters are easy for non-mathematicians to understand.
The user is allowed to specify the power of the spline, and also the
positions of the knots and/or reference points.
Full documentation of the program (including Methods and Formulas)
can be found in the ancillary file bspline.pdf, which can be viewed
using the Adobe Acrobat Reader.

Author: Roger Newson
Distribution-date: 20 October 2003
Stata-version: 6

INSTALLATION FILES (click here to install
> )

ANCILLARY FILES (click here to get)
(click here to return to the previous screen)

Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
or 020 7848 6605 International +44 20 7848 6605
Email: [email protected]

Opinions expressed are those of the author, not the institution.

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